Transistor biasing Alinco DX-SR8

[mkube396]

I have 2 bad final output transistors in my Alinco DX-SR8T I ordered 2 new RD100HHF1C
I'm reading up on how to bias this MOSFETS and I'm a bit confused on where to get the current reading? do I just take it from the overall current the radio is taking from the power supply? so lets say the radio is drawing  .8 amps I just bring it up to 1.6amps?
 
on page 38.
http://dw.hampedia.net:8090/downloads/alinco/hampedia.net.dx-sr8t_Service_manual.pdf